Protococcoitleon, Palmellacene, Tetraedron. 597 



stitutis; cellulis q rufulo viridibus, srfpius lato lunatis, apices ver- 

 sus leniter attonuatis; apiciltus in procossus hinos, liyalinos, rectos 

 abeuntihus, quiiita vel sexta louf^itudine cellulrc longis; diani, famil. 

 00 7.. circ; <liin. cell. (excl. proc.) 35^ 15 a. 



ITafj. in stagnis « Mawgan N. Cornwall» Britannia-; (A. W. P>rn- 

 nett). — Selenastro Qracili Reinsch affine, dilTert cellulis pro 

 rationn latioribus, apicibus bidontatis. 



ACTINASTRUM Lagerh. [1882] P.idrag till Kannod. om Stockholm- 

 straktons Pediastreer Protoc. och. Palmell. p. 70 (I<]tym. aclin 

 radius ot as/.ron stella), ITansg. Prodr. p. 120. — Celluhit^ fusi- 

 formes, rarius fore obclavatfe vel cylindrica^, a centro communi 

 radiatim exeuntos, familias quadricellulares vel octocellulares, ra- 

 rius ItVcellulares, libere natantes formantes; contontus cellularum, 

 ut videtur, dilute viridis, ad cellularum apieos subhyalinus. 



Propagatio divisione succoilanea plasmatis cellularum fit ot fa- 

 milia filialis eo modo formata ruptura membran?e cellulae matricalis 

 libera -ovadit. Zoogonidia ignota. 



Ob>i. Genus habitu (eve Ccrasfcriam Reinsch aomulans. 



I . Actinastrum Hantzschii Lagerh. 1. c. p. 70, t. 3, f. 25-20, Hansg, im 

 Prodr. p. 120, n. 109, f- 07. — Character idem ac goneris; cel- 

 lulis 10-21-3-0, rectis, oblongo-conoideis, apico attenuatis, mox 

 acuminatis, radiatim dispositis; membrana cellularum tonui, hya- 

 lina. 



Haf>. in rivulis, aquis lente fluentibus s. stagnantibus otc. 

 « Lohmon prope Dnesdon)) Germania) (C. A. Hantzscii), pr. «Dan- 

 vikoni) Sueci.i^ (G. Lagerheim) pr. « Prag ot Lomnic ») P>ohomi;v 

 (A. HANSaiRG). 



TETRAEDRON Kuotz. ') [1845] Phyc. gorm. p. 129, Species p. 102, 

 (liltym. ietvas quatuor et cdra facies), Hansg. in Iledwigia 1888. 

 p. 130 ot 1889, p. 17, AUericiiim Corda [1839] Alra. <\. Carlsb. 

 p. 230, Polyedrium Naeg. [1849] Gatt. oinzoll. Alg. p. 83, Kuotz. 



1) Clarus riansgir^' (Hedwigia 1880 pag. 17) opinatur gcnera Polyedrium 

 Nacg., Cernslerius Rcinsnh Clnsleridiiim Reinsch (= Reinschiella milii) Tham- 

 7iiaslrum Roinsch suh nno nomino Te'raedri Kuetz. coadunanda csse. Ipse 

 vero, noa invito Flansgirg, ol) celhilariim formam satis supcrque diversam 

 seorsim retiniii. llac cailem ratione snhf^oniis quoque Pseudn-f;/nfcras(rum 

 Hansg. in genori.s grailum in po.^torum elevari poterit. 



